The invention relates to the field of battery safety, and particularly discloses a cumulative risk modeling method for judging the voltage consistency of a battery pack, The cumulative risk modeling method comprises the following steps of: S1, acquiring a time-varying single voltage value of a single battery; S2, calculating a voltage center value of the single voltage value; S3, calculating a first-order center moment between the voltage center value and each single voltage value; and S4, accumulating the first-order central moment to obtain an accumulated risk value of the single battery. The cumulative risk modeling method determines the voltage center value as a standard (step S2), represents a cell difference using the first-order center distance between a cell voltage value and the voltage center value (step S3), and represents a process in which the cell difference changes from a quantitative change to a qualitative change in time dimension and an abnormal change (step S4) by anintegrated method. Compared with an existing value domain method, a description statistics method, an internal resistance estimation method, a feature analysis method and other quantification methods, the cumulative risk modeling method can better represent the difference of the single voltage values, the discrimination degree of an accident vehicle and a normal vehicle is large, and the calculation amount of the cumulative risk modeling method is small.
本发明涉及电池安全领域,具体公开了一种判断电池包电压一致性的累计风险建模方法,包括步骤:S1.获取单体电池随时间变化的单体电压值;S2.计算单体电压值的电压中心值;S3.计算电压中心值与每个单体电压值之间的一阶中心矩;S4.对一阶中心矩进行累计,得到单体电池的累计风险值。本方法确定作为标准的电压中心值(步骤S2),用单体电压值与电压中心值的一阶中心距表现单体差异(步骤S3),通过累计的方法表现单体差异在时间维度上从量变到质变的过程和异常变化(步骤S4)。相比现有值域方法、描述统计方法、内阻估算方法、特征分析方法等量化方法,本方法更能表现单体电压值的差异性,使得事故车和正常车区分度较大,且本方法运算量小。
Cumulative risk modeling method for judging voltage consistency of battery pack
一种判断电池包电压一致性的累计风险建模方法
13.10.2020
Patent
Elektronische Ressource
Chinesisch
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